// created by gpake
(function () {
	let config = {
		qiniuRegion: "",
		qiniuImageURLPrefix: "",
		qiniuUploadToken: "",
		qiniuUploadTokenURL: "",
		qiniuUploadTokenFunction: null
	};
	module.exports = {
		init,
		upload,
	};
	// 在整个程序生命周期中，只需要 init 一次即可
	// 如果需要变更参数，再调用 init 即可
	function init(options) {
		config = {
			qiniuRegion: "",
			qiniuImageURLPrefix: "",
			qiniuUploadToken: "",
			qiniuUploadTokenURL: "",
			qiniuUploadTokenFunction: null
		};
		updateConfigWithOptions(options);
	}

	function updateConfigWithOptions(options) {
		if (options.region) {
			config.qiniuRegion = options.region;
		} else {
			console.error("qiniu uploader need your bucket region");
		}
		if (options.uptoken) {
			config.qiniuUploadToken = options.uptoken;
		} else if (options.uptokenURL) {
			config.qiniuUploadTokenURL = options.uptokenURL;
		} else if (options.uptokenFunc) {
			config.qiniuUploadTokenFunction = options.uptokenFunc;
		}
		if (options.domain) {
			config.qiniuImageURLPrefix = options.domain;
		}
	}

	function upload(filePath, success, fail, options) {
		if (null == filePath) {
			console.error("qiniu uploader need filePath to upload");
			return;
		}
		if (options) {
			init(options);
		}
		if (config.qiniuUploadToken) {
			doUpload(filePath, success, fail, options);
		} else if (config.qiniuUploadTokenURL) {
			getQiniuToken(function () {
				doUpload(filePath, success, fail, options);
			});
		} else if (config.qiniuUploadTokenFunction) {
			config.qiniuUploadToken = config.qiniuUploadTokenFunction();
		} else {
			console.error("qiniu uploader need one of [uptoken, uptokenURL, uptokenFunc]");
			return;
		}
	}

	function doUpload(filePath, success, fail, options) {
		let url = uploadURLFromRegionCode(config.qiniuRegion);
		let fileName = filePath.split("//")[1];
		if (options && options.key) {
			fileName = options.key;
		}
		let formData = {
			"token": config.qiniuUploadToken,
			"key": fileName
		};
		wx.uploadFile({
			url,
			filePath,
			name: "file",
			formData,
			success (res) {
				let dataString = res.data;
				let dataObject = JSON.parse(dataString);
				// do something
				let imageUrl = config.qiniuImageURLPrefix + dataObject.key;
				dataObject.imageURL = imageUrl;
				// console.log(dataObject);
				if (success) {
					success(dataObject);
				}
			},
			fail (error) {
				console.log(error);
				if (fail) {
					fail(error);
				}
			}
		});
	}

	function getQiniuToken(callback) {
		wx.request({
			url: config.qiniuUploadTokenURL,
			success (res) {
				let token = res.data.uptoken;
				config.qiniuUploadToken = token;
				if (callback) {
					callback();
				}
			},
			fail (error) {
				console.log(error);
			}
		});
	}

	function uploadURLFromRegionCode(code) {
		let uploadURL = null;
		switch (code) {
		case "ECN": uploadURL = "https://up.qbox.me"; break;
		case "NCN": uploadURL = "https://up-z1.qbox.me"; break;
		case "SCN": uploadURL = "https://up-z2.qbox.me"; break;
		case "NA": uploadURL = "https://up-na0.qbox.me"; break;
		default: console.error("please make the region is with one of [ECN, SCN, NCN, NA]");
		}
		return uploadURL;
	}

})();